wayland: add support for linux-dmabuf

wl_drm is a legacy protocol, and wlroots is getting rid of it [1].
Use the newer and standard linux-dmabuf protocol if available to
get the DRM device.

[1]: https://gitlab.freedesktop.org/wlroots/wlroots/-/merge_requests/4397

Signed-off-by: Simon Ser <contact@emersion.fr>

Author: emersion

configure.ac

@@ -75,7 +75,8 @@ m4_define([libva_lt_age],
           [m4_eval(libva_binary_age - libva_interface_age)])
 
 # libdrm minimun version requirement
-m4_define([libdrm_version], [2.4.60])
+# 2.4.75 for drmGetDevices2
+m4_define([libdrm_version], [2.4.75])
 
 # Wayland minimum version number
 # 1.11.0 for wl_proxy_create_wrapper

meson.build

@@ -85,7 +85,7 @@ cc = meson.get_compiler('c')
 dl_dep = cc.find_library('dl', required : false)
 
 WITH_DRM = not get_option('disable_drm') and (host_machine.system() != 'windows')
-libdrm_dep = dependency('libdrm', version : '>= 2.4.60', required : (host_machine.system() != 'windows'))
+libdrm_dep = dependency('libdrm', version : '>= 2.4.75', required : (host_machine.system() != 'windows'))
 
 WITH_X11 = false
 if get_option('with_x11') != 'no'

va/meson.build

@@ -228,6 +228,7 @@ endif
 if WITH_WAYLAND
   libva_wayland_sources = [
     'wayland/va_wayland.c',
+    'wayland/va_wayland_linux_dmabuf.c',
     'wayland/va_wayland_drm.c',
     'wayland/va_wayland_emgd.c',
     'drm/va_drm_utils.c',
@@ -241,24 +242,31 @@ if WITH_WAYLAND
   libva_headers_subproject += libva_wayland_headers
 
   libva_wayland_headers_priv = [
+    'wayland/va_wayland_linux_dmabuf.h',
     'wayland/va_wayland_drm.h',
     'wayland/va_wayland_emgd.h',
     'wayland/va_wayland_private.h',
   ]
 
-  protocol_files = [
-    custom_target(
-      'wayland-drm-client-protocol.c',
-      output : 'wayland-drm-client-protocol.c',
-      input : 'wayland/wayland-drm.xml',
-      command : [wl_scanner, 'private-code', '@INPUT@', '@OUTPUT@']),
-
-    custom_target(
-      'wayland-drm-client-protocol.h',
-      output : 'wayland-drm-client-protocol.h',
-      input : 'wayland/wayland-drm.xml',
+  # XXX: grab linux-dmabuf-v1.xml from wayland-protocols
+  protocols = {
+    'wayland-drm': 'wayland/wayland-drm.xml',
+    'linux-dmabuf-v1': 'wayland/linux-dmabuf-v1.xml',
+  }
+
+  protocol_files = []
+  foreach name, xml : protocols
+    protocol_files += custom_target(
+      name + '-client-protocol.c',
+      output : name + '-client-protocol.c',
+      input : xml,
+      command : [wl_scanner, 'private-code', '@INPUT@', '@OUTPUT@'])
+    protocol_files += custom_target(
+      name + '-client-protocol.h',
+      output : name + '-client-protocol.h',
+      input : xml,
       command : [wl_scanner, 'client-header', '@INPUT@', '@OUTPUT@'])
-  ]
+  endforeach
 
   install_headers(libva_wayland_headers, subdir : 'va')
 

va/wayland/Makefile.am

@@ -29,6 +29,7 @@ AM_CPPFLAGS = \
 
 source_c = \
 	va_wayland.c		\
+	va_wayland_linux_dmabuf.c \
 	va_wayland_drm.c	\
 	va_wayland_emgd.c	\
 	../drm/va_drm_utils.c 	\
@@ -40,16 +41,19 @@ source_h = \
 	$(NULL)
 
 source_h_priv = \
+	va_wayland_linux_dmabuf.h \
 	va_wayland_drm.h	\
 	va_wayland_emgd.h	\
 	va_wayland_private.h	\
 	$(NULL)
 
 protocol_source_c = \
+	linux-dmabuf-v1-client-protocol.c \
 	wayland-drm-client-protocol.c	\
 	$(NULL)
 
 protocol_source_h = \
+	linux-dmabuf-v1-client-protocol.h \
 	wayland-drm-client-protocol.h	\
 	$(NULL)
 
@@ -61,13 +65,15 @@ noinst_HEADERS			= $(source_h_priv)
 
 # Wayland protocol
 va_wayland_drm.c: $(protocol_source_h)
+va_wayland_linux_dmabuf.c: $(protocol_source_h)
 %-client-protocol.h : %.xml
 	$(AM_V_GEN)$(WAYLAND_SCANNER) client-header < $< > $@
 %-client-protocol.c : %.xml
 	$(AM_V_GEN)$(WAYLAND_SCANNER) private-code < $< > $@
 
 EXTRA_DIST = \
 	wayland-drm.xml         \
+	linux-dmabuf-v1.xml     \
 	$(NULL)
 
 BUILT_SOURCES = $(protocol_source_h) $(protocol_source_c)